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Packet data transmission with mixed automatic request to resend

A technology for automatically retransmitting requests and grouping data. It is used in data exchange networks, digital transmission systems, and transmission modification based on link quality. It can solve problems such as increased transmission errors, non-self-decoding of packets, and reduced data throughput.

Inactive Publication Date: 2002-05-29
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] According to the hybrid ARQ method used in the prior art, if the channel environment becomes worse, the data throughput rate of the system decreases and the number of transmission errors increases
Also, when originally transmitted packets are severely corrupted by fading, they are difficult to decode after being combined with retransmitted redundant bits because these packets are not self-decodable

Method used

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  • Packet data transmission with mixed automatic request to resend
  • Packet data transmission with mixed automatic request to resend
  • Packet data transmission with mixed automatic request to resend

Examples

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Embodiment Construction

[0018] Preferred embodiments of the present invention will now be described in detail with reference to examples in the accompanying drawings.

[0019] A current hybrid ARQ scheme combines Forward Error Correction (FEC) and Automatic Repeat Request (ARQ) technologies, and thus can enhance data transmission reliability and data throughput in a communication system. The purpose of ARQ is to increase the reliability of packet data transmission by retransmitting the same data to the receiving system until the receiving system receives the data without error. On the other hand, FEC technology utilizes error correction codes to correct delay errors that occur due to poor channel environments.

[0020] In a system using hybrid ARQ of type 1, if an error occurs while decoding a transmitted packet, the same packet is retransmitted again. Generally, adding FEC technology helps to increase the data throughput rate of the system with poor channel environment. However, when the channel e...

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Abstract

A method of transmitting packet data to a receiver in a communication system using a Hybrid ARQ technique is disclosed. In accordance with one illustrative embodiment of the present invention, an index representative of how much the first packet being transmitted such as a signal-to-noise (Eb / No) ratio is compared to a predetermined threshold value when an error is occurred during the step of decoding the packet. If the index is greater than or equal to the threshold value, the first packet transmitted is stored in a buffer and a receiver requests to transmit a second additional packet encoded with a lower code rate. On the other hand, if the index is less than the threshold value, the receiver requests to re-transmit the first packet encoded with the same code rate.

Description

field of invention [0001] The present invention relates to packet data transmission, and more particularly to a method for transmitting packet data using a hybrid ARQ (Automatic Repeat Request) scheme, wherein the packet retransmission request depends on an index representing the degree of corruption of the first transmitted packet data . Background technique [0002] In general, Automatic Repeat Request (ARQ) and Forward Error Correction (FEC) are well known error control techniques commonly used in many communication systems. In a communication system utilizing ARQ, if data is not received at all or is received erroneously, the receiving system makes a request to retransmit the data. Therefore, the purpose of ARQ is to increase the reliability of packet data transmission by retransmitting the same data to the receiving system until the receiving system receives the data without errors. ARQ technology provides very reliable communication, but it also introduces undesired ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/12H04L1/00H04L1/16H04L1/18
CPCH04L1/1819H04L1/0013H04L1/1825H04L1/1816H04L1/0068H04L1/1845H04L1/1671H04L1/12
Inventor 李永朝金沂浚庆赞浩
Owner LG ELECTRONICS INC